HORTICULTURE

Detailed explanation-1: -The cell wall which is made up of cellulose gives the plant cell rigidity resulting in a fixed, rectangular shape. Animal cells lack the rigidity hence, they tend to have a round and irregular shape.

Detailed explanation-2: -Plant cells have a fixed shape which is rectangular. These two cells are eukaryotic which are found in green plants and photosynthetic eukaryotes which have a membrane-bound nucleus. Plant cells are bigger than animal cells and are rectangular.

Detailed explanation-3: -The main difference between animal cells and plant cells is that plant cells have cell walls, while animal cells lack cell walls. The cell wall made of cellulose gives plant cells rigidity, thus forming a fixed rectangular shape. Animal cells lack rigidity, so they tend to have round and irregular shapes.

Detailed explanation-4: -The reason why cells of the plants have a fixed shape is that these cells have a very hard and rigid outer covering called the cell wall which surrounds it. This cell wall does not allow the cell to change its shape. The cell wall is generally composed of pectin, cellulose and some other important polysaccharides.

Detailed explanation-5: -Answer: An organism that has no definite shape and it keeps on changing its shape is an amoeba.